Apparently, Quarq power meters don’t like bad tasting batteries any more than young children. Quarq sent out a service announcement last night indicating that Duracell’s new so-called “bitter batteries”, which have a bitter tasting coating to deter young children from putting them in their mouths, can cause issues with the company’s power meters.
Specifically, the CR2032 batteries can cause the LED to not function, cadence and power dropouts (including for extended periods of time), as well as the unit failing to wake up or pair. In other words, basically any type of failure you could conceive of, these batteries probably caused it. About the only symptom not on the list would be ‘power meter explodes’.